package com.jbricx.swing.ui.tabs;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.plaf.basic.BasicButtonUI;

/**
 * 
 * @author Daniel Larsen
 * 
 * Used to set the individual tab's "X" button, and their title. 
 * 
 * Uses some swing black magic.
 *
 */
@SuppressWarnings("serial")
public class ButtonTabComponent extends JPanel {
	private final JBricxEditorTabFolder pane;
	
	public ButtonTabComponent(final JBricxEditorTabFolder pane) {
        //unset default FlowLayout' gaps
        super(new FlowLayout(FlowLayout.LEFT, 0, 0));
        if (pane == null) {
            throw new NullPointerException("TabbedPane is null");
        }
        this.pane = pane;
        setOpaque(false);
         
        //make JLabel read titles from JTabbedPane
        JLabel label = new JLabel() {
            @Override
			public String getText() {
                int i = pane.indexOfTabComponent(ButtonTabComponent.this);
                if (i != -1) {
                    return pane.getTitleAt(i);
                }
                return null;
            }
        };
         
        add(label);
        //add more space between the label and the button
        label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
        //tab button
        JButton button = new TabButton();
        add(button);
        //add more space to the top of the component
        setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));
    }
	private class TabButton extends JButton implements ActionListener {
		public TabButton() {
        int size = 17;
        setPreferredSize(new Dimension(size, size));
        setToolTipText("close this tab");
        //Make the button looks the same for all Laf's
        setUI(new BasicButtonUI());
        //Make it transparent
        setContentAreaFilled(false);
        //No need to be focusable
        setFocusable(false);
        setBorder(BorderFactory.createEtchedBorder());
        setBorderPainted(false);
        //Making nice rollover effect
        //we use the same listener for all buttons
        addMouseListener(buttonMouseListener);
        setRolloverEnabled(true);
        //Close the proper tab by clicking the button
        addActionListener(this);
    }

	/**
	 * Closes the file upon request.
	 * Calls closeFile to remove from the internal arraylist
	 * then calls remove to remove from the panes.
	 */
    public void actionPerformed(ActionEvent e) {
        int i = pane.indexOfTabComponent(ButtonTabComponent.this);
        	 if (i != -1 && pane.closeFile(i)) {
                 pane.remove(i);
             }
       
    }

    //we don't want to update UI for this button
    @Override
	public void updateUI() {
    }

    //paint the cross
    @Override
	protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g.create();
        //shift the image for pressed buttons
        if (getModel().isPressed()) {
            g2.translate(1, 1);
        }
        g2.setStroke(new BasicStroke(2));
        g2.setColor(Color.BLACK);
        if (getModel().isRollover()) {
            g2.setColor(Color.MAGENTA);
        }
        int delta = 6;
        g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight() - delta - 1);
        g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight() - delta - 1);
        g2.dispose();
    }
    

 final MouseListener buttonMouseListener = new MouseAdapter() {
    @Override
	public void mouseEntered(MouseEvent e) {
        Component component = e.getComponent();
        if (component instanceof AbstractButton) {
            AbstractButton button = (AbstractButton) component;
            button.setBorderPainted(true);
        }
    }

    @Override
	public void mouseExited(MouseEvent e) {
        Component component = e.getComponent();
        if (component instanceof AbstractButton) {
            AbstractButton button = (AbstractButton) component;
            button.setBorderPainted(false);
        }
    }
};
}
}